An Oregon man accused of sexual assaults wrote detailed plans for carrying out attacks against his victims, according to an affidavit.

Negasi Zuberi, a 29-year-old married father, was arrested in July after a woman escaped from a makeshift cinder block cell in his Klamath Falls home, where she told authorities Zuberi held her hostage and sexually assaulted her.

"According to the complaint, this woman was kidnapped, chained, sexually assaulted, and locked in a cinder block cell," FBI Portland Assistant Special Agent in Charge Stephanie Shark said in a Wednesday statement. "Police say she beat the door with her hands until they were bloody in order to break free. Her quick thinking and will to survive may have saved other women from a similar nightmare."

Notes that investigators found in Zuberi's home appear to depict the suspect's plans to organize and carry out his alleged crimes.

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One page of notes obtained by law enforcement titled "Operation Take Over" had two bullet points.

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The first bullet read, "Leave phone at home," and the second stated, "Make sure they don't have a bunch of ppl [sic] in their life. You don't want any type of investigation."

Another page showed a drawing with a note that read, "Dig a hole straight down 100 ft," along with what appear to be the words, "concrete block," "rubber coat," "foam insulation" and "waterproof concrete."

Just before his arrest on July 15, Zuberi allegedly traveled from Klamath Falls to Seattle — a seven-and-a-half-hour drive — and solicited services from the victim, a sex worker. Zuberi then posed as a police officer and restrained the woman in handcuffs and leg irons while pointing a Taser at her, the FBI said.

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The suspect drove the victim 450 miles back to his Oregon home and raped her during the trip back, according to the affidavit. He then allegedly held her hostage in the cell inside his garage, which had a door installed in reverse so that it could not be opened from the inside, the FBI said.

The victim "briefly slept and awoke to the realization that she would likely die if she did not attempt to escape," the affidavit states. She "repeatedly banged on the door and was able to break the door open and escape the room. Once outside of the cell, she observed…Zuberi's vehicle parked in the garage, opened the vehicle door, observed the handgun, retrieved it, and fled."

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Once outside Zuberi's home, she flagged down a passing driver, who called 911.

"We are fortunate that this brave woman escaped and alerted authorities," Shark said." Through quick law enforcement action, we were able to get Zuberi in custody the next day. While she may have helped protect future victims, sadly we have now linked Zuberi to additional violent sexual assaults in at least four states, and there could be more."

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Authorities located Zuberi parked in a Walmart parking lot in Reno, Nevada, on July 16.

"Law enforcement observed Zuberi holding one of his children in the front seat of his vehicle. Zuberi's wife was outside the vehicle speaking to him," the affidavit states. "When Zuberi was contacted by law enforcement, he refused to exit the vehicle and cut himself with a sharp object causing him to bleed profusely. He also attempted to destroy his phone. Zuberi eventually agreed to exit the vehicle and was taken into custody. The child was unharmed."

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Zuberi is charged with kidnapping and transportation with intent to engage in sexual activity. 

The FBI believes Zuberi, who has ties to 10 different states over the last 10 years, may be involved in additional attacks and is asking any other victims who may have encountered the suspect to contact authorities. The other states other than Oregon may include California, Washington, Colorado, Utah, Florida, New York, New Jersey, Alabama and Nevada, the FBI said.

The 29-year-old sometimes went by different aliases, including "Sakima," "Justin Hyche" and "Justi Koussai."